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AlienVault OTX Malware

An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.

CVE-2023-4692 is a heap-based buffer overflow vulnerability identified in the NTFS filesystem driver component of the GRUB2 bootloader. GRUB2 is widely used as a bootloader in many Linux distributions and supports booting from NTFS filesystems, commonly used in dual-boot scenarios with Windows. The vulnerability arises from an out-of-bounds write condition when parsing specially crafted NTFS filesystem images. This flaw leads to corruption of heap metadata within GRUB2, which can destabilize the bootloader's memory management. In certain conditions, the heap metadata corruption can propagate to the UEFI firmware heap metadata, which is critical for secure boot operations. Exploiting this vulnerability can allow an attacker to execute arbitrary code during the boot process, effectively bypassing secure boot protections designed to prevent unauthorized firmware or OS loaders from running. The attack vector requires local access with high privileges (e.g., root or administrator) and has a high attack complexity, meaning it is not trivial to exploit. No user interaction is required once the attacker has the necessary access. The vulnerability has a CVSS v3.1 score of 7.5, reflecting high impact on confidentiality, integrity, and availability, with a scope change due to potential firmware compromise. Currently, there are no known exploits in the wild, and no official patches have been linked yet, but the issue is publicly disclosed and should be addressed promptly.

Detailed information about CVE-2023-4692: Heap-based Buffer Overflow. Get real-time updates, technical details, and mitigation strategies.

CVE-2023-4692: Heap-based Buffer Overflow - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-4692: Heap-based Buffer Overflow

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